If the last iteration should be added, and if it should be marked symbolically (with
l) or with the iteration number.Not every iteration level is able to identify the
last iteration early enough to be able to output. When this keyword is activated all
iteration levels are checked for the last iteration step.

controls part of the filename for output. use __STD_OUT__ (exactly as written here)
for the screen or standard logger. use filename to obtain projectname-filename.
use ./filename to get filename. A middle name (if present), iteration numbers and
extension are always added to the filename. if you want to avoid it use =filename,
in this case the filename is always exactly as typed. Please note that this can lead
to clashes of filenames.